Răspuns:
Explicație pas cu pas:
1/1×2=1-1/2
1/2×3=1/2-1/3
1/3×4=1/3-1/4
1/98×99=1/98-1/99
1/99×100=1/99-1/100
.......................................... Adunam in fiecare parte, se observa ca, in stanga , termenii se reduc pe diagonala
S=1-1/100=(100-1)/100=99/100
E=99/100:{(3/5)^4×(3/5)³:(3/5)^5]=
=99/100:(3/5)^(4+3-5)
=99/100:(3/5)²=
=99/100×25/9=11/4
